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tests: make doctests not depend on str(ParseError()) format

Authored by martinvonz.

Description

tests: make doctests not depend on str(ParseError()) format

ParseError implements __bytes__, but it doesn't implement
__str__, so it gets the default __str__ implementation. The next
patch will make it so ParseError gets a __str__ implementation,
which changes the format slightly. This prepares by making us not
depend on the format.

Differential Revision: https://phab.mercurial-scm.org/D9349